1. Departments of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, IA, USA
2. Biomedical Engineering, and University of Iowa, Iowa City, IA, USA
3. Department of Orthopaedics, Kwangju Christian Hospital, Gwangju, Korea
4. Statistics and Actuarial Science, University of Iowa, Iowa City, IA, USA
5. Department of Veterinary Clinical Sciences, Iowa State University, Ames, IA, USA